As for CF2021, it gets updates into 2025, and the currently running pre-release of CF2023 is a great sign for the continued vitality of CF. But this looming deadline for CF2018 is a reminder that as the years roll on, we not only get new versions but we must say good-bye to old ones.
Wondering what you can do? or when CF2021 or CF2023 support will end also? And what's the difference between "core" and "extended" support Adobe sells? (The extended support plan does NOT provide updates beyond this coming July.) For more on these, including official Adobe documentation that discusses such things, as well as my thoughts on migration, costs, various options to consider, and more, do read on.